Help me plz. Have problem with my wallet

Help please I have problems with my ltc wallet.
mails of registration of a purse:,
I received on my purse ltc but can not withdraw I’m writing a purse is encrypted and asks for a password which I do not remember installing it in 2011.
date file is somewhere on your computer but I can not find it. but if I find something there will be my password? … Help solve the problem plz